Transformer-cover construction



R. V. BINGAY.

TRANSFORMER COVER CONSTRUCTION. APPLICATION FILED OCT, 17. 1919.

1,400,515. I Patented Dec. 20, 1921.

UNITED STATES PATENT OFFICE;

ROBERT V. BINGAY, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO PITTSBURGH TRANSFORMER COMPANY, A CORPORATION OF PENNSYLVANIA.

TRANSFORMER-COVER CONSTRUCTION.

Applicationfiled October 17, 1919.

To all whom it may con cern Be it known that I, ROBERT V. BINGAY, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of. Pennsylvania, have invented certain new and useful Improvements in Transformer-Coyer Constructions, of which the following is a specification.

This invention relates to the cover of transformer casings or tanks and particularly to means for fastening the cover and tank together. The object of the invention is to provide a cover with fastening means forming a tight seal against leakage and especially the entrance of moisture during damp weather where the transformer is' located in an exposed position, and which cover moreover is easily positioned and released, and also permits interchangeability of covers and tanks.

In prior practice the tanks usually have been flanged and the covers fastened by bolts through the flanges, a gasket being placed between. the parts andthe bolt holes being alined'by-drilling through the assembled flanges and gasket or by using expensive jigs or templets. In such a construction the omission or loosening vof a bolt would provide opportunity for entrance 0 moisture through the corresponding bolt hole because'of the shorter gasket width at that pointand its loosening by reason of the absenceof the bolt; Moreover the flanges when once drilled could only be repositioned by matching each hole with its mate exactly vas previously drilled so a particular position of a single cover was required to reform the joint, and. removal of the cover required the unscrewing of the nuts off all the bolts. p

All of these objections are overcome in the cover of this invention set forth in the following description taken with the accompanying drawings in which- Figure 1 is an elevation of a transformer top illustrating one embodiment of the invention, and

Fig. 2 isa sectional view on enlarged scale of a detail of Fig. .1.

In" the accompanying drawings a tank 3 containing the transformer coils and core immersed in oil has a cover 4 adapted to be fastened to flange 5 on' the tank 3, with-a gasket 6 "between the flange and the cover. The cover is provided with the usual manhole 10 and bushing holes 11 for the trans- Specification of Letters Patent.

Patented Dec. 20, 1921.

Serial No. 331,321.

former leads and blow offs, which may if desired, be covered in the manner herein described with respect to the main cover 4. To provide for carrying off water and clamping the top or cover securely in place its outer edge 13 is extended over the edge of flange 5 andprovided with spaced holes 14 for bolts 15 passing through clamp lugs 16 and provided with washers 17 and nuts 18 to tighten said lugs. The clamp lugs 16 have upward bent ends 20 bearing against the under surface of the edge 13 and inwardly extending arms 21 engaging flatwise against flange 5.

Tightening of the nuts 18 tips the levers or lugs 16 around theirends 21 and flexes them to bring a-distributed upward pressure against flange At the same time the bolts 1'5 draw down on the cover so that the flange 5 and gasket 6 are pinched between the cover and inner arms of the clamp levers. The flange and gasket arecontinuous with no holes through them and a wide tight seal is assured. A cover when removed can be replaced without bringing bolt holes into alinement and any cover will fit any similarly sized transformer tank. In order ,to release the cover it is only necessary to loosen the nuts 18 and turn the clamp levers away from the flange and similarly in replacement the clamps remain assembled on the cover and only have to be tightened to refasten the cover in place.

I claim 2- 1. The combination with a tank having a flange, of a cover having an edge overhanging said flange, a series of bolts passing through saidedge, and a series of complementary clamping lugs carried thereby. the opposite ends of which lugs are adapted to exert upward pressure upon-the under side of said flange and the under side of the overhanging cover respectively.

2. The combination with a tank having a flange, of a cover having an edge overhanging said flange, a series of bolts passing through said edge, and a series of complementary clamping lugs carried thereby, the opposite ends of which lugs are adapted to exert upward pressure upon the under side of said flange and the under side of the overhanging cover respectively, the said between the said ends.

ROBERT v. BINGAY. 

